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Published: Wednesday 07 August, 2013

guess handbags on sale guess handbags on sale gas methane has been rising

The uptick is tiny, especially compared with the growth in carbondioxide emissions from industrial activity and landuse changes. But the shift has still raised eyebrows.

Pound for pound, methane is 25 times more effective as a greenhouse gas than carbon dioxide. So powerful is its effect that some experts have proposed that the world could meet climate targets more readily if it made big strides in reducing methane and other gre guess handbags on sale enhouse gases that are less abundant but more potent.

If the increase seen last year continues unabated, researchers worry that over the long term, it could help bring on significant additional warming. As Earths climate warms, it could trigger a steady release of methane as permafrost in the Northern Hemispheres high latitudes th guess handbags on sale aws and the organic material it kept on ice begins todecompose. The more methane the permafrost loses, the more the climate warms.

The increase comes on top of a period where methane barely increased at all, says Ed Dlugokencky, a researcher at the National Oceanic and Atmospheric Administrations Earth Systems Research Laboratory in Boulder, Colo. I think thats why it looks so remarkable.

During the early 1980s, he says, methane levels in the atmosphere rose at an average annual rate of 14 molecules for every billion molecules of other gases, although the growth rate was beginning to slow over that period. From 1999 to 200 guess handbags on sale 6, methanes abundance in the atmosphere was relatively constant.

When its direct and indirect effects on the atmosphere are considered, its current warming effect is about half that of CO2, even though it is far less abundant. Both gases are substantially more abundant now than at any time during the last 650,000 years, according to research summarized by the Intergovernmental Panel on Climate Change last year.

Last years methane rise may stem from wetlands emissions at high latitudes in the northern hemisphere, Dr. Dlugokencky speculates. He notes that 2007 was a particularly warm year there. Were pretty sure it didnt come from biomass burning because the data doesnt show a big increase in carbon monoxide, another byproduct of burning biomass.

Methane rises from natural sources such as wetlands as submerged plant material decays wildfires, permafrost, and ocean sources. But estimates put humanrelated emissions from farming to landfills at some 60 percent of the methane in the air.. guess handbags on sale